[ntp:questions] National time standard differences
Richard B. Gilbert
rgilbert88 at comcast.net
Tue Feb 9 15:07:38 UTC 2010
David J Taylor wrote:
>> I've setup an NTP server in the south east asia region synchonising
>> with regional NTP servers as well as a couple of servers I am
>> responsible for in the US.
>> remote st t when poll reach delay offset jitter
>> +Japan 1 u 454 1024 377 87.402 -0.560 0.056
>> *Japan 1 u 476 1024 377 87.277 -0.810 1.542
>> -NorthAmerica 2 u 427 1024 377 285.387 -17.741 5.084
>> -NorthAmerica 2 u 429 1024 377 307.208 -17.061 0.083
>> Is the above delta seen between Japanese and North American time
>> sources purely the delta between the outbound / return network path or
>> something else?
> Most likely asymmetrical paths, yes. To answer your implied question,
> it is most /unlikely/ that the USA National Time is 17 milliseconds away
> from Japan National Time, if that's what you were thinking. National
> time differences are likely to be microseconds or less, I believe.
I believe that the word "less" is appropriate here but might be called
an understatement. I'd guess that the various national time standards
are within nanoseconds or less.
More information about the questions